> dd if=/dev/sd[abcd] of=/dev/null the only thing really wrong with that is that you're using 512 byte IOs, which is ridiculously inefficient. disks these days don't do IO in 512B chunks, so there's no justification for this. (the last time I did a scan of a sick disk, IIRC the minimum data size was actually 8K - that was an old deathstar that someone had flopping around loose inside a case...) using, say, 128KB chunks will consume less overhead. using O_DIRECT will also treat the rest your system a bit nicer. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
